Drop in Isolator

An Drop-in isolator is an electronic device used to achieve RF signal isolation in a circuit. The Drop-in isolator has a specific frequency bandwidth. Within the passband, signals can be smoothly transmitted from Rx Port 1 to Antenna Port 2 in the specified direction. However, due to its isolation, signals from Antenna Port 2 cannot be transmitted to Tx Port 1. Therefore, it has the function of one-way transmission, also known as a one-way transformer.

The Drop-in isolator consists of a cavity, a rotating magnet, an inner conductor, and a bias magnetic field. The two welding ports of the inner conductor protrude from the outside of the cavity, making it convenient for customers to weld with the circuit board. Generally, Drop-in isolators have installation holes with through holes or threaded holes, making it convenient for customers to install.

Drop-in isolators are mainly used to protect front-end devices, and the most typical application is to protect the power amplifier tube in RF power amplifiers (the amplified signal of the power amplifier tube is transmitted to the antenna through the Drop-in isolator, and in the event of antenna mismatch, the signal cannot be reflected to the front end of the isolator, ensuring that the power amplifier tube is not burned out).

The load port of the Drop-in isolator also has 20dB or 30dB chip attenuator to connected. The function of this chip attenuator is to detect antenna port mismatch. If the antenna port mismatch occurs, the signal is transmitted to the chip attenuator, and after a 20dB or 30dB attenuation, the signal has decayed to an unusually weak state. And engineers can use this weak signal to control the front-end circuit, such as shutting down and other operations.